BillMinder was one of the first bill tracking apps to hit the App Store and it has only gotten better over time. BillMinder was recently update to v2.0, which features, among other things, a new interface that is not only easier on the eyes but also easier to use.
BillMinder already contains tons of features to help you pay your bills on time, including the ability to calculate bill amounts, categorize accounts, backup and restore to a file, export to Excel, record paid date and amount, and alerts and icon badging. BillMinder also has the ability to send Push Notifications when bills are due via a $.99 in-app purchase. It is an annual charge that must be renewed manually. With v2.0, things just keep getting better.
BillMinder v2.0 features: